The party will know more about Tiax's past and define a future of one man. The quest was designed with an evil player in mind, so the rewards for the good party will not be great, save for the deed itself.
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The quest begins in the city of Baldur's Gate, not far from the Iron Throne building. http://www.forgottenwars.com/bg1/ar1200.htm
A gnome, Belgin, stands in the top left corner of the map. He approaches the party, if he sees Tiax.
The party can send him away at once, in which case he doesn't come back.
If they agree to listen to Belgin, however, it turns out that Belgin is Tiax's old travelling companion, who is now hunted for Tiax's murder. Seeing Tiax alive and well, Belgin asks the party to help him clear his name, and to visit Blade and Stars to show Tiax to the mercenaries.
The player can also try and force some money from Belgin at this point. Belgin will wait for the party in Helm and Cloak, an inn in Baldur's Gate.
If the player has chosen to help Belgin, the party can proceed to Helm and Cloak. However, if Tiax is in party, he proclaims he had a vision from Cyric, and must kill Belgin now. WARNING: If the party does not assist Tiax in this matter, or delay the murder for too long, Tiax will eventually leave forever!
At Helm and Cloak, the party may yet again make a choice. Killing Belgin will net the party 2000 gold, and helping him - only 1000.
For more detail, this is Caillean's testing report:
I tested Tiax' quest today, so here is my report:
- I killed him. Reputation -1 and 2000 GP were to be found on his body.
In the end it comes down to three possible outcomes:
1.) Help Belgin and receive 1000 GP and Tiax leaves the party
2.) Kill Belgin and receive 2000 GP and suffer a loss of reputation -1